237118 2022-02-23 15:47:31 -0800 live.com uses a lot of CPU whenever the window loses / gains focus 2022-06-23 15:41:30 -0700 1 1 1 Unclassified WebKit Layout and Rendering WebKit Nightly Build Unspecified Unspecified ASSIGNED https://bugs.webkit.org/show_bug.cgi?id=167997 InRadar P2 Normal --- 1 cdumez cdumez ap bfulgham ggaren simon.fraser webkit-bug-importer zalan oldest_to_newest 1845378 0 cdumez 2022-02-23 15:47:31 -0800 live.com uses a lot of CPU whenever the window loses / gains focus. 1845385 1 453038 cdumez 2022-02-23 15:53:15 -0800 Created attachment 453038 Patch 1845401 2 simon.fraser 2022-02-23 16:09:34 -0800 I'm concerned that we're optimizing for a one-time paint on window activation/deactivation as opposed to a continual 10% background CPU usage, which we saw on some pages when fixing bug 167997. 1845404 3 cdumez 2022-02-23 16:16:36 -0800 (In reply to Simon Fraser (smfr) from comment #2) > I'm concerned that we're optimizing for a one-time paint on window > activation/deactivation as opposed to a continual 10% background CPU usage, > which we saw on some pages when fixing bug 167997. I agree it is not ideal. My thinking was that focusing / unfocusing windows is a lot more common than this corner case where: 1. The Safari window is only partially visible 2. The part that is visible is being repainted BUT doesn't visually changes due to large tiles 3. The page is using a lot of CPU due to timers I think ideally, we'd make it a lot cheaper to repaint this page. However, this is not something I know how to do, which is why I proposed this as a mitigation. 1845490 4 ggaren 2022-02-23 20:10:21 -0800 What if we make the tile size smaller if and only if we are a foreground tab in a non-foreground window and we find ourselves (re-)painting frequently? -- at first glance, that would seem to be the best of both worlds. 1845492 5 simon.fraser 2022-02-23 20:24:46 -0800 Rather than complicate the tiling logic, I'd prefer to just minimize the cost of the blur. 1845494 6 ggaren 2022-02-23 20:37:20 -0800 (In reply to Simon Fraser (smfr) from comment #5) > Rather than complicate the tiling logic, I'd prefer to just minimize the > cost of the blur. Do we have a way to do that? 1845498 7 simon.fraser 2022-02-23 20:48:50 -0800 Options: 1. in this particular case only blur the non-clipped part of the content 2. get CoreImage filters working 3. make the blurred element a compositing layer, in which case we'll let CA do the blur (but with possible knock-on effects triggering more compositing layers) 1845504 8 ggaren 2022-02-23 21:26:12 -0800 Are we sure that a clipped blur is the only case where we expect painting to be expensive? 1845505 9 simon.fraser 2022-02-23 21:29:46 -0800 Blurs in general are expensive to compute, which we do at paint time (when not composited). Other things are too, but non-composited filters are one of the more common causes of expensive painting. 1847648 10 webkit-bug-importer 2022-03-02 15:48:17 -0800 <rdar://problem/89717354> 1877940 11 bfulgham 2022-06-23 15:41:30 -0700 This appears to actually be tracked by: rdar://89029702 453038 2022-02-23 15:53:15 -0800 2022-02-23 18:50:06 -0800 Patch bug-237118-20220223155314.patch text/plain 11513 cdumez U3VidmVyc2lvbiBSZXZpc2lvbjogMjkwMzkyCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggNjkxM2I2ZTEzNDFhMDgz OTBlZGJkNDU2NzBkMTVmZmM3ZjU0MDIyOC4uZDg2OGQwOWY1ZDg1MGQ2N2E1NmU0MjE5NTQ4NTlk MDg5YWYwODNmNSAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDI4IEBACisyMDIyLTAyLTIzICBDaHJp cyBEdW1leiAgPGNkdW1lekBhcHBsZS5jb20+CisKKyAgICAgICAgbGl2ZS5jb20gdXNlcyBhIGxv dCBvZiBDUFUgd2hlbmV2ZXIgdGhlIHdpbmRvdyBsb3NlcyAvIGdhaW5zIGZvY3VzCisgICAgICAg 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